🔷 Strand E: Spatial Sense
By Grade 3, students are expected to estimate, measure, and compare the areas of a variety of two-dimensional shapes, including those with curved sides, using standard metric units such as square centimetres (cm²) and square metres (m²). They learn that area is the amount of surface a shape covers, and that using square units provides a consistent way to measure and compare spaces accurately.
At this stage, children explore how to cover surfaces with square units and count how many are needed, developing an understanding of how measurement relates to both length and width. They also practise estimating before measuring to build reasoning and visualization skills. Through activities such as measuring a piece of paper, a tabletop, or a classroom floor, students connect these ideas to real-world applications, strengthening their ability to use standard measurement tools and units effectively.
This learning falls under the Measurement strand of the Ontario Mathematics Curriculum.
In Grade 3, students are expected to “use square centimetres (cm²) and square metres (m²) to estimate, measure, and compare the areas of various two-dimensional shapes, including those with curved sides.” (E2.9)
